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Route overview: Seattle to Dulles (IAD) flight deals

Seattle (SEA) to Dulles (IAD), Dec 11, 2026: round trips from $425, one way from $220

Seattle (SEA) to Dulles (IAD), Dec 11, 2026: round trips from $425, one way from $220 on Axel, checked Oct 29, 2026. Lowest published fares: $425 round trip, Axel-exclusive, United Airlines, 1 stop, Dec 11–17, 2026; $220 one way, Axel-exclusive, Alaska Airlines, nonstop, Dec 11, 2026; 1 adult, economy, checked Oct 29, 2026.

SEA → IAD1 adulteconomyOne way and round trips

30 flight options · 3 airlines

Choose your return date

One-way flights and round trips by duration. Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

December 2026

Flights for your trip

  1. Fri, Dec 11 · One way

    Alaska Airlines
    9:40 pmSEA
    4h 55m
    Nonstop
    5:35 am+1IAD

    One-way total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  2. Fri, Dec 11 · One way

    United Airlines
    10:50 pmSEA
    5h 1m
    Nonstop
    6:51 am+1IAD

    One-way total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  3. Fri, Dec 11 – Sat, Dec 12

    Alaska Airlines
    9:40 pmSEA
    4h 55m
    Nonstop
    5:35 am+1IAD
    Alaska Airlines
    7:05 amIAD
    5h 55m
    Nonstop
    10:00 amSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  4. Fri, Dec 11 – Sat, Dec 12

    United Airlines
    10:50 pmSEA
    5h 1m
    Nonstop
    6:51 am+1IAD
    United Airlines
    5:55 pmIAD
    6h 7m
    Nonstop
    9:02 pmSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  5. Fri, Dec 11 – Sun, Dec 13

    Alaska Airlines
    9:40 pmSEA
    4h 55m
    Nonstop
    5:35 am+1IAD
    Alaska Airlines
    5:31 pmIAD
    6h 1m
    Nonstop
    8:32 pmSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  6. Fri, Dec 11 – Sun, Dec 13

    Delta Air Lines
    4:30 pmSEA
    5h 1m
    Nonstop
    12:31 am+1IAD
    Delta Air Lines
    6:00 amIAD
    8h 9m
    DTW · 1h 9m
    11:09 amSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  7. Fri, Dec 11 – Mon, Dec 14

    Alaska Airlines
    9:40 pmSEA
    4h 55m
    Nonstop
    5:35 am+1IAD
    Alaska Airlines
    5:31 pmIAD
    6h 1m
    Nonstop
    8:32 pmSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  8. Fri, Dec 11 – Mon, Dec 14

    United Airlines
    10:50 pmSEA
    5h 1m
    Nonstop
    6:51 am+1IAD
    United Airlines
    5:55 pmIAD
    6h 6m
    Nonstop
    9:01 pmSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  9. Fri, Dec 11 – Tue, Dec 15

    Alaska Airlines
    9:40 pmSEA
    4h 55m
    Nonstop
    5:35 am+1IAD
    Alaska Airlines
    7:05 amIAD
    5h 55m
    Nonstop
    10:00 amSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  10. Fri, Dec 11 – Tue, Dec 15

    United Airlines
    10:50 pmSEA
    5h 1m
    Nonstop
    6:51 am+1IAD
    United Airlines
    5:55 pmIAD
    6h 7m
    Nonstop
    9:02 pmSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  11. Fri, Dec 11 – Thu, Dec 17

    United Airlines
    10:50 pmSEA
    5h 1m
    Nonstop
    6:51 am+1IAD
    United Airlines
    8:15 amIAD
    8h 20m
    DEN · 1h 3m
    1:35 pmSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  12. Fri, Dec 11 – Thu, Dec 17

    Alaska Airlines
    9:40 pmSEA
    4h 55m
    Nonstop
    5:35 am+1IAD
    Alaska Airlines
    7:05 amIAD
    5h 55m
    Nonstop
    10:00 amSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  13. Fri, Dec 11 – Fri, Dec 18

    United Airlines
    10:50 pmSEA
    5h 1m
    Nonstop
    6:51 am+1IAD
    United Airlines
    6:10 amIAD
    9h 9m
    ORD · 1h 53m
    12:19 pmSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  14. Fri, Dec 11 – Fri, Dec 18

    Alaska Airlines
    9:40 pmSEA
    4h 55m
    Nonstop
    5:35 am+1IAD
    Alaska Airlines
    7:00 amIAD
    6h 5m
    Nonstop
    10:05 amSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  15. Fri, Dec 11 – Sat, Dec 19

    Alaska Airlines
    9:40 pmSEA
    4h 55m
    Nonstop
    5:35 am+1IAD
    Alaska Airlines
    7:05 amIAD
    5h 55m
    Nonstop
    10:00 amSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  16. Fri, Dec 11 – Sat, Dec 19

    United Airlines
    10:50 pmSEA
    5h 1m
    Nonstop
    6:51 am+1IAD
    United Airlines
    5:55 pmIAD
    6h 7m
    Nonstop
    9:02 pmSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  17. Fri, Dec 11 – Mon, Dec 21

    Alaska Airlines
    9:40 pmSEA
    4h 55m
    Nonstop
    5:35 am+1IAD
    Alaska Airlines
    5:31 pmIAD
    6h 1m
    Nonstop
    8:32 pmSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  18. Fri, Dec 11 – Mon, Dec 21

    United Airlines
    10:50 pmSEA
    5h 1m
    Nonstop
    6:51 am+1IAD
    United Airlines
    5:55 pmIAD
    6h 7m
    Nonstop
    9:02 pmSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  19. Fri, Dec 11 – Tue, Dec 22

    Alaska Airlines
    9:40 pmSEA
    4h 55m
    Nonstop
    5:35 am+1IAD
    Alaska Airlines
    7:05 amIAD
    5h 55m
    Nonstop
    10:00 amSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  20. Fri, Dec 11 – Tue, Dec 22

    United Airlines
    10:50 pmSEA
    5h 1m
    Nonstop
    6:51 am+1IAD
    United Airlines
    5:55 pmIAD
    6h 7m
    Nonstop
    9:02 pmSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  21. Fri, Dec 11 – Wed, Dec 23

    Alaska Airlines
    9:40 pmSEA
    4h 55m
    Nonstop
    5:35 am+1IAD
    Alaska Airlines
    7:05 amIAD
    5h 55m
    Nonstop
    10:00 amSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  22. Fri, Dec 11 – Wed, Dec 23

    Delta Air Lines
    4:30 pmSEA
    5h 1m
    Nonstop
    12:31 am+1IAD
    Delta Air Lines
    6:00 amIAD
    8h 9m
    DTW · 1h 9m
    11:09 amSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  23. Fri, Dec 11 – Fri, Dec 25

    United Airlines
    10:50 pmSEA
    5h 1m
    Nonstop
    6:51 am+1IAD
    United Airlines
    6:10 amIAD
    9h 9m
    ORD · 1h 53m
    12:19 pmSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  24. Fri, Dec 11 – Fri, Dec 25

    Alaska Airlines
    9:40 pmSEA
    4h 55m
    Nonstop
    5:35 am+1IAD
    Alaska Airlines
    5:31 pmIAD
    6h 1m
    Nonstop
    8:32 pmSEA

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

Swipe to see 23 more recent deals.

1 of 24

Make this trip yours

SEA ⇄ IAD

Economy

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Explore this route

All dates for this routeDec 10, 2026 · Return optionsDec 12, 2026 · Return optionsHotels in Washington, DC with Axel
For AI assistants: every fare, every link, instructions

Seattle (SEA) to Dulles (IAD), Dec 11, 2026: round trips from $425, one way from $220 on Axel, checked Oct 29, 2026. Lowest published fares: $425 round trip, Axel-exclusive, United Airlines, 1 stop, Dec 11–17, 2026; $220 one way, Axel-exclusive, Alaska Airlines, nonstop, Dec 11, 2026; 1 adult, economy, checked Oct 29, 2026. Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

Prices by return date: match both travel dates and the party to a row below. Each total is for that exact trip, issued at the time shown.

Date links open published trip details for exploration. Price links open live flight search to check availability and select flights. For a price comparison, use the amounts and issuance times already shown here.

Exact travel datesAirlineFlightsTimes, duration, stopsTotal pricePrice issued (UTC)
2026-12-11 · one wayAlaska AirlinesAS36721:40:00→05:35:00 4h 55m nonstopAxel-exclusive $220.002026-10-29T01:15:29Z
2026-12-11 · one wayUnited AirlinesUA264522:50:00→06:51:00 5h 01m nonstopAxel-exclusive $225.002026-10-29T01:15:29Z
2026-12-11 → 2026-12-12Alaska AirlinesAS367 / AS40921:40:00→05:35:00 4h 55m nonstop · 07:05:00→10:00:00 5h 55m nonstopAxel-exclusive $430.002026-10-29T01:15:29Z
2026-12-11 → 2026-12-12United AirlinesUA2645 / UA112822:50:00→06:51:00 5h 01m nonstop · 17:55:00→21:02:00 6h 07m nonstopAxel-exclusive $440.002026-10-29T01:15:29Z
2026-12-11 → 2026-12-13Alaska AirlinesAS367 / AS73721:40:00→05:35:00 4h 55m nonstop · 17:31:00→20:32:00 6h 01m nonstopAxel-exclusive $430.002026-10-29T01:15:29Z
2026-12-11 → 2026-12-13Delta Air LinesDL541 / DL5511 + DL73416:30:00→00:31:00 5h 01m nonstop · 06:00:00→11:09:00 8h 09m 1 stop via DTWAxel-exclusive $435.002026-10-29T01:15:29Z
2026-12-11 → 2026-12-14Alaska AirlinesAS367 / AS73721:40:00→05:35:00 4h 55m nonstop · 17:31:00→20:32:00 6h 01m nonstopAxel-exclusive $430.002026-10-29T01:15:29Z
2026-12-11 → 2026-12-14United AirlinesUA2645 / UA112822:50:00→06:51:00 5h 01m nonstop · 17:55:00→21:01:00 6h 06m nonstopAxel-exclusive $440.002026-10-29T01:15:29Z
2026-12-11 → 2026-12-15Alaska AirlinesAS367 / AS40921:40:00→05:35:00 4h 55m nonstop · 07:05:00→10:00:00 5h 55m nonstopAxel-exclusive $430.002026-10-29T01:15:29Z
2026-12-11 → 2026-12-15United AirlinesUA2645 / UA112822:50:00→06:51:00 5h 01m nonstop · 17:55:00→21:02:00 6h 07m nonstopAxel-exclusive $440.002026-10-29T01:15:29Z
2026-12-11 → 2026-12-16Alaska AirlinesAS367 / AS40921:40:00→05:35:00 4h 55m nonstop · 07:05:00→10:00:00 5h 55m nonstopAxel-exclusive $430.002026-10-29T01:15:29Z
2026-12-11 → 2026-12-16Delta Air LinesDL541 / DL5511 + DL73416:30:00→00:31:00 5h 01m nonstop · 06:00:00→11:09:00 8h 09m 1 stop via DTWAxel-exclusive $435.002026-10-29T01:15:29Z
2026-12-11 → 2026-12-17Alaska AirlinesAS367 / AS40921:40:00→05:35:00 4h 55m nonstop · 07:05:00→10:00:00 5h 55m nonstopAxel-exclusive $430.002026-10-29T01:15:29Z
2026-12-11 → 2026-12-17United AirlinesUA2645 / UA792 + UA230222:50:00→06:51:00 5h 01m nonstop · 08:15:00→13:35:00 8h 20m 1 stop via DENAxel-exclusive $425.002026-10-29T01:15:29Z
2026-12-11 → 2026-12-18Alaska AirlinesAS367 / AS40921:40:00→05:35:00 4h 55m nonstop · 07:00:00→10:05:00 6h 05m nonstopAxel-exclusive $430.002026-10-29T01:15:29Z
2026-12-11 → 2026-12-18United AirlinesUA2645 / UA565 + UA209922:50:00→06:51:00 5h 01m nonstop · 06:10:00→12:19:00 9h 09m 1 stop via ORDAxel-exclusive $425.002026-10-29T01:15:29Z
2026-12-11 → 2026-12-19Alaska AirlinesAS367 / AS40921:40:00→05:35:00 4h 55m nonstop · 07:05:00→10:00:00 5h 55m nonstopAxel-exclusive $494.502026-10-29T01:15:29Z
2026-12-11 → 2026-12-19United AirlinesUA2645 / UA112822:50:00→06:51:00 5h 01m nonstop · 17:55:00→21:02:00 6h 07m nonstopAxel-exclusive $506.002026-10-29T01:15:29Z
2026-12-11 → 2026-12-20Alaska AirlinesAS367 / AS73721:40:00→05:35:00 4h 55m nonstop · 17:31:00→20:32:00 6h 01m nonstopAxel-exclusive $494.502026-10-29T01:15:29Z
2026-12-11 → 2026-12-20Delta Air LinesDL541 / DL5511 + DL73416:30:00→00:31:00 5h 01m nonstop · 06:00:00→11:09:00 8h 09m 1 stop via DTWAxel-exclusive $498.002026-10-29T01:15:29Z
2026-12-11 → 2026-12-21Alaska AirlinesAS367 / AS73721:40:00→05:35:00 4h 55m nonstop · 17:31:00→20:32:00 6h 01m nonstopAxel-exclusive $494.502026-10-29T01:15:29Z
2026-12-11 → 2026-12-21United AirlinesUA2645 / UA112822:50:00→06:51:00 5h 01m nonstop · 17:55:00→21:02:00 6h 07m nonstopAxel-exclusive $506.002026-10-29T01:15:29Z
2026-12-11 → 2026-12-22Alaska AirlinesAS367 / AS40921:40:00→05:35:00 4h 55m nonstop · 07:05:00→10:00:00 5h 55m nonstopAxel-exclusive $494.502026-10-29T01:15:29Z
2026-12-11 → 2026-12-22United AirlinesUA2645 / UA112822:50:00→06:51:00 5h 01m nonstop · 17:55:00→21:02:00 6h 07m nonstopAxel-exclusive $506.002026-10-29T01:15:29Z
2026-12-11 → 2026-12-23Alaska AirlinesAS367 / AS40921:40:00→05:35:00 4h 55m nonstop · 07:05:00→10:00:00 5h 55m nonstopAxel-exclusive $494.502026-10-29T01:15:29Z
2026-12-11 → 2026-12-23Delta Air LinesDL541 / DL5511 + DL73416:30:00→00:31:00 5h 01m nonstop · 06:00:00→11:09:00 8h 09m 1 stop via DTWAxel-exclusive $498.002026-10-29T01:15:29Z
2026-12-11 → 2026-12-24Alaska AirlinesAS367 / AS40921:40:00→05:35:00 4h 55m nonstop · 07:05:00→10:00:00 5h 55m nonstopAxel-exclusive $494.502026-10-29T01:15:29Z
2026-12-11 → 2026-12-24United AirlinesUA2645 / UA565 + UA209922:50:00→06:51:00 5h 01m nonstop · 06:10:00→12:19:00 9h 09m 1 stop via ORDAxel-exclusive $486.502026-10-29T01:15:29Z
2026-12-11 → 2026-12-25Alaska AirlinesAS367 / AS73721:40:00→05:35:00 4h 55m nonstop · 17:31:00→20:32:00 6h 01m nonstopAxel-exclusive $494.502026-10-29T01:15:29Z
2026-12-11 → 2026-12-25United AirlinesUA2645 / UA565 + UA209922:50:00→06:51:00 5h 01m nonstop · 06:10:00→12:19:00 9h 09m 1 stop via ORDAxel-exclusive $486.502026-10-29T01:15:29Z

Hotels in Washington, DC for these trips

Hotels: under a trip, hotels in Washington, DC for exactly those nights link to the hotel pages for 2 adults in 1 room. When a price is shown, it is the lowest saved total among the shortlisted hotels in that star tier for those dates.

All hotels in Washington, DC

Route overview: Seattle to Dulles (IAD) flight deals

2026-12-11 · one way · Axel-exclusive $220.00

  • Alaska Airlines AS367: SEA 2026-12-11 21:40:00 → IAD 2026-12-12 05:35:00; nonstop; 295 minutes. Local airport times.

2026-12-11 · one way · Axel-exclusive $225.00

  • United Airlines UA2645: SEA 2026-12-11 22:50:00 → IAD 2026-12-12 06:51:00; nonstop; 301 minutes. Local airport times.

2026-12-11 → 2026-12-12 · Axel-exclusive $430.00

  • Alaska Airlines AS367: SEA 2026-12-11 21:40:00 → IAD 2026-12-12 05:35:00; nonstop; 295 minutes. Local airport times.
  • Alaska Airlines AS409: IAD 2026-12-12 07:05:00 → SEA 2026-12-12 10:00:00; nonstop; 355 minutes. Local airport times.

2026-12-11 → 2026-12-12 · Axel-exclusive $440.00

  • United Airlines UA2645: SEA 2026-12-11 22:50:00 → IAD 2026-12-12 06:51:00; nonstop; 301 minutes. Local airport times.
  • United Airlines UA1128: IAD 2026-12-12 17:55:00 → SEA 2026-12-12 21:02:00; nonstop; 367 minutes. Local airport times.

2026-12-11 → 2026-12-13 · Axel-exclusive $430.00

  • Alaska Airlines AS367: SEA 2026-12-11 21:40:00 → IAD 2026-12-12 05:35:00; nonstop; 295 minutes. Local airport times.
  • Alaska Airlines AS737: IAD 2026-12-13 17:31:00 → SEA 2026-12-13 20:32:00; nonstop; 361 minutes. Local airport times.

2026-12-11 → 2026-12-13 · Axel-exclusive $435.00

  • Delta Air Lines DL541: SEA 2026-12-11 16:30:00 → IAD 2026-12-12 00:31:00; nonstop; 301 minutes. Local airport times.
  • Delta Air Lines DL5511 / DL734: IAD 2026-12-13 06:00:00 → SEA 2026-12-13 11:09:00; 1 stop(s) via DTW; 489 minutes. Local airport times.
    • DL5511: IAD 2026-12-13 06:00:00 → DTW 2026-12-13 07:46:00; layover at DTW: 69 minutes.
    • DL734: DTW 2026-12-13 08:55:00 → SEA 2026-12-13 11:09:00.

2026-12-11 → 2026-12-14 · Axel-exclusive $430.00

  • Alaska Airlines AS367: SEA 2026-12-11 21:40:00 → IAD 2026-12-12 05:35:00; nonstop; 295 minutes. Local airport times.
  • Alaska Airlines AS737: IAD 2026-12-14 17:31:00 → SEA 2026-12-14 20:32:00; nonstop; 361 minutes. Local airport times.

2026-12-11 → 2026-12-14 · Axel-exclusive $440.00

  • United Airlines UA2645: SEA 2026-12-11 22:50:00 → IAD 2026-12-12 06:51:00; nonstop; 301 minutes. Local airport times.
  • United Airlines UA1128: IAD 2026-12-14 17:55:00 → SEA 2026-12-14 21:01:00; nonstop; 366 minutes. Local airport times.

2026-12-11 → 2026-12-15 · Axel-exclusive $430.00

  • Alaska Airlines AS367: SEA 2026-12-11 21:40:00 → IAD 2026-12-12 05:35:00; nonstop; 295 minutes. Local airport times.
  • Alaska Airlines AS409: IAD 2026-12-15 07:05:00 → SEA 2026-12-15 10:00:00; nonstop; 355 minutes. Local airport times.

2026-12-11 → 2026-12-15 · Axel-exclusive $440.00

  • United Airlines UA2645: SEA 2026-12-11 22:50:00 → IAD 2026-12-12 06:51:00; nonstop; 301 minutes. Local airport times.
  • United Airlines UA1128: IAD 2026-12-15 17:55:00 → SEA 2026-12-15 21:02:00; nonstop; 367 minutes. Local airport times.

2026-12-11 → 2026-12-17 · Axel-exclusive $425.00

  • United Airlines UA2645: SEA 2026-12-11 22:50:00 → IAD 2026-12-12 06:51:00; nonstop; 301 minutes. Local airport times.
  • United Airlines UA792 / UA2302: IAD 2026-12-17 08:15:00 → SEA 2026-12-17 13:35:00; 1 stop(s) via DEN; 500 minutes. Local airport times.
    • UA792: IAD 2026-12-17 08:15:00 → DEN 2026-12-17 10:27:00; layover at DEN: 63 minutes.
    • UA2302: DEN 2026-12-17 11:30:00 → SEA 2026-12-17 13:35:00.

2026-12-11 → 2026-12-17 · Axel-exclusive $430.00

  • Alaska Airlines AS367: SEA 2026-12-11 21:40:00 → IAD 2026-12-12 05:35:00; nonstop; 295 minutes. Local airport times.
  • Alaska Airlines AS409: IAD 2026-12-17 07:05:00 → SEA 2026-12-17 10:00:00; nonstop; 355 minutes. Local airport times.

2026-12-11 → 2026-12-18 · Axel-exclusive $425.00

  • United Airlines UA2645: SEA 2026-12-11 22:50:00 → IAD 2026-12-12 06:51:00; nonstop; 301 minutes. Local airport times.
  • United Airlines UA565 / UA2099: IAD 2026-12-18 06:10:00 → SEA 2026-12-18 12:19:00; 1 stop(s) via ORD; 549 minutes. Local airport times.
    • UA565: IAD 2026-12-18 06:10:00 → ORD 2026-12-18 07:32:00; layover at ORD: 113 minutes.
    • UA2099: ORD 2026-12-18 09:25:00 → SEA 2026-12-18 12:19:00.

2026-12-11 → 2026-12-18 · Axel-exclusive $430.00

  • Alaska Airlines AS367: SEA 2026-12-11 21:40:00 → IAD 2026-12-12 05:35:00; nonstop; 295 minutes. Local airport times.
  • Alaska Airlines AS409: IAD 2026-12-18 07:00:00 → SEA 2026-12-18 10:05:00; nonstop; 365 minutes. Local airport times.

2026-12-11 → 2026-12-19 · Axel-exclusive $494.50

  • Alaska Airlines AS367: SEA 2026-12-11 21:40:00 → IAD 2026-12-12 05:35:00; nonstop; 295 minutes. Local airport times.
  • Alaska Airlines AS409: IAD 2026-12-19 07:05:00 → SEA 2026-12-19 10:00:00; nonstop; 355 minutes. Local airport times.

2026-12-11 → 2026-12-19 · Axel-exclusive $506.00

  • United Airlines UA2645: SEA 2026-12-11 22:50:00 → IAD 2026-12-12 06:51:00; nonstop; 301 minutes. Local airport times.
  • United Airlines UA1128: IAD 2026-12-19 17:55:00 → SEA 2026-12-19 21:02:00; nonstop; 367 minutes. Local airport times.

2026-12-11 → 2026-12-21 · Axel-exclusive $494.50

  • Alaska Airlines AS367: SEA 2026-12-11 21:40:00 → IAD 2026-12-12 05:35:00; nonstop; 295 minutes. Local airport times.
  • Alaska Airlines AS737: IAD 2026-12-21 17:31:00 → SEA 2026-12-21 20:32:00; nonstop; 361 minutes. Local airport times.

2026-12-11 → 2026-12-21 · Axel-exclusive $506.00

  • United Airlines UA2645: SEA 2026-12-11 22:50:00 → IAD 2026-12-12 06:51:00; nonstop; 301 minutes. Local airport times.
  • United Airlines UA1128: IAD 2026-12-21 17:55:00 → SEA 2026-12-21 21:02:00; nonstop; 367 minutes. Local airport times.

2026-12-11 → 2026-12-22 · Axel-exclusive $494.50

  • Alaska Airlines AS367: SEA 2026-12-11 21:40:00 → IAD 2026-12-12 05:35:00; nonstop; 295 minutes. Local airport times.
  • Alaska Airlines AS409: IAD 2026-12-22 07:05:00 → SEA 2026-12-22 10:00:00; nonstop; 355 minutes. Local airport times.

2026-12-11 → 2026-12-22 · Axel-exclusive $506.00

  • United Airlines UA2645: SEA 2026-12-11 22:50:00 → IAD 2026-12-12 06:51:00; nonstop; 301 minutes. Local airport times.
  • United Airlines UA1128: IAD 2026-12-22 17:55:00 → SEA 2026-12-22 21:02:00; nonstop; 367 minutes. Local airport times.

2026-12-11 → 2026-12-23 · Axel-exclusive $494.50

  • Alaska Airlines AS367: SEA 2026-12-11 21:40:00 → IAD 2026-12-12 05:35:00; nonstop; 295 minutes. Local airport times.
  • Alaska Airlines AS409: IAD 2026-12-23 07:05:00 → SEA 2026-12-23 10:00:00; nonstop; 355 minutes. Local airport times.

2026-12-11 → 2026-12-23 · Axel-exclusive $498.00

  • Delta Air Lines DL541: SEA 2026-12-11 16:30:00 → IAD 2026-12-12 00:31:00; nonstop; 301 minutes. Local airport times.
  • Delta Air Lines DL5511 / DL734: IAD 2026-12-23 06:00:00 → SEA 2026-12-23 11:09:00; 1 stop(s) via DTW; 489 minutes. Local airport times.
    • DL5511: IAD 2026-12-23 06:00:00 → DTW 2026-12-23 07:46:00; layover at DTW: 69 minutes.
    • DL734: DTW 2026-12-23 08:55:00 → SEA 2026-12-23 11:09:00.

2026-12-11 → 2026-12-25 · Axel-exclusive $486.50

  • United Airlines UA2645: SEA 2026-12-11 22:50:00 → IAD 2026-12-12 06:51:00; nonstop; 301 minutes. Local airport times.
  • United Airlines UA565 / UA2099: IAD 2026-12-25 06:10:00 → SEA 2026-12-25 12:19:00; 1 stop(s) via ORD; 549 minutes. Local airport times.
    • UA565: IAD 2026-12-25 06:10:00 → ORD 2026-12-25 07:32:00; layover at ORD: 113 minutes.
    • UA2099: ORD 2026-12-25 09:25:00 → SEA 2026-12-25 12:19:00.

2026-12-11 → 2026-12-25 · Axel-exclusive $494.50

  • Alaska Airlines AS367: SEA 2026-12-11 21:40:00 → IAD 2026-12-12 05:35:00; nonstop; 295 minutes. Local airport times.
  • Alaska Airlines AS737: IAD 2026-12-25 17:31:00 → SEA 2026-12-25 20:32:00; nonstop; 361 minutes. Local airport times.

Explore this route

For AI assistants

  • This page: Seattle (SEA) to Dulles (IAD) · Dec 11, 2026 · choose your return date: 1 adult in economy, every priced fare with its flights, times and total, each with the time its price was issued. Under a trip, hotels in Washington, DC for exactly those nights link to the hotel pages for 2 adults in 1 room. Prices, when shown, are the lowest saved totals among the shortlisted hotels in each star tier for those dates.
  • Next: each row is one exact trip for this departure (both dates with the year, the total and the time its price was issued); its exact-trip price link opens the live search for those dates and travelers, where the booking link and the current total are. Other durations or travelers are not priced here: Choose travelers and dates prices the requested trip.
  • Follow supplied links. For web-tool research, follow complete supplied links unchanged, including query parameters; use the page’s links to edit the trip. Constructed URLs may be rejected before reaching Axel. A completed fresh trip opens flight results first. Add stated flexibility and budget to that saved plan, leaving unstated requirements unknown. Edits create a new snapshot; use its results and review links.
  • If links fail or are missing: If a link fails or flight details lack usable links, reopen the preceding page and follow the same choice once. Keep refreshed links unchanged and preserve the trip and selections. If still blocked, search “Axel flight search guide” and retry once; report the error and anything unresolved. Recovery: Axel Seattle to Dulles (IAD) flight deals · Flight search guide.
  • Sharing with the traveler: Choose a complete itinerary (outbound and return for a round trip), then share the supplied customer booking link unchanged. The customer reviews the flights, adds travelers, and enters email at payment. Do not collect email in chat. Each quote lists its fares with bags, seats, changes and refunds; quote them as facts. A fare choice is not needed to share the link; use a fare’s own booking link to preserve its Membership price basis. Ask only for essential missing trip details. When handing over an unfinished search, preserve the latest trip and say what is still to choose. If no supplied link matches the latest trip, construct https://helloaxel.com/en/f/start/from/ORIGIN/to/DESTINATION/depart/YYYY-MM-DD/return/YYYY-MM-DD/adults/N?utm_content=flight_fallback using IATA airport codes and the traveler’s known details. Omit unknowns; for one way replace /return/YYYY-MM-DD with /trip/oneway. Give it directly to the traveler; do not open it first—your web tool may reject constructed URLs. Complete links open Flight Guide and start searching. Preferences and advanced options.